### Contact Information _No response_ ### MaxKB Version v2.4.1 ### Problem Description 知识库工作流全局变量使用报错 ### Steps to Reproduce 1.知识库工作流设置变量,使用指定回复输出 <img width="1878" height="834" alt="Image" src="https://github.com/user-attachments/assets/c9d86e99-711b-4cba-a92c-c668eaa5edec" /> 2.问题现象 <img width="1917" height="839" alt="Image" src="https://github.com/user-attachments/assets/01f3a3c4-1968-4393-9e2a-2809af3e7093" /> ### The expected correct result _No response_ ### Related log output ```shell ``` ### Additional Information _No response_